ON.energy · 3 weeks ago
Jr. Project Engineer – Battery Energy Storage Systems (BESS)
Reston, VA
Full-time
Hybrid
New Grad, Entry Level
0+ years expON.energy is building the power infrastructure that makes the AI era possible by providing a new class of power technology. The Jr. Project Engineer will support the engineering execution of Battery Energy Storage System (BESS) projects for data centers, involving technical coordination, design validation, and collaboration with various stakeholders to ensure successful project delivery.
AnalyticsEnergyEnergy ManagementEnergy StorageRenewable EnergySoftware
Responsibilities
Assist in the end-to-end execution of BESS projects, including design, procurement, installation, and commissioning
Serve as a technical resource for project managers and coordinate with engineering, procurement, and construction teams to meet project milestones
Collaborate with customers, EPC contractors, OEMs, and consultants to integrate BESS into data center electrical infrastructure
Review and validate system designs (electrical, civil, mechanical) and vendor submittals for compliance and quality
Develop electrical drawings such as single-line diagrams, schematics, and wiring diagrams for battery storage systems
Prepare equipment specifications, data sheets, purchase requisitions, and bid evaluations for electrical components (inverters, switchgear, transformers, etc.)
Perform system studies (short circuit, load flow, arc flash) using software tools like ETAP or SKM
Support project scheduling, procurement planning, and technical documentation
Participate in site walks, installation support, and commissioning activities
Assist with Factory and Site Acceptance Testing (FAT/SAT) of BESS components
Identify technical risks and propose mitigation strategies in coordination with project management
Ensure compliance with relevant codes (NEC, IEEE, NFPA) and company standards
Qualification
Required
Bachelor's degree in Electrical Engineering, Mechanical Engineering, or a related field
0–3 years of engineering experience (internships or co-op experience acceptable)
Understanding of electrical schematics and system design fundamentals
Proficiency in Microsoft Office; basic knowledge of AutoCAD and power system analysis tools (ETAP, SKM)
Ability to read and interpret engineering drawings and specifications
Willingness to travel up to 30% for project site visits
Preferred
Familiarity with energy storage systems (e.g., CATL, Sungrow, Tesla) and high-voltage infrastructure preferred
Basic understanding of civil, mechanical, and structural aspects of projects
Strong problem-solving skills and ability to think creatively
Excellent attention to detail and documentation skills
Effective communication and teamwork abilities
Benefits
Competitive salary + performance bonus
401(k) match, health, vision, dental
Paid time off and company holidays
Work that matters—building resilient, secure infrastructure for the future of energy
Company
ON.energy
Battery storage IPP. A fully-integrated energy storage developer, technology company and asset owner. using proprietary software.
51-200 employees
Funding
Current Stage
Growth StageTotal Funding
$262.6MKey Investors
Lombard Odier Investment ManagersLive Oak BankUltra Capital
2025-01-28Debt Financing· $77.6M
2024-04-25Debt Financing· $25M
2023-12-20Debt Financing· $40M
Leadership Team
Alan Cooper
Chief Executive Officer
Ricardo de Azevedo
Chief Technology Officer
Recent News
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